Circular orbits and related quasiharmonic oscillatory motion of charged particles around weakly magnetized rotating black holes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F16%3AN0000022" target="_blank" >RIV/47813059:19240/16:N0000022 - isvavai.cz</a>

Result on the web

<a href="http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.084012" target="_blank" >http://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.084012</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.93.084012" target="_blank" >10.1103/PhysRevD.93.084012</a>

Result language

angličtina

Original language name

Circular orbits and related quasiharmonic oscillatory motion of charged particles around weakly magnetized rotating black holes

Original language description

We study the motion of charged particles in the field of a rotating black hole immersed into an external asymptotically uniform magnetic field, focusing on the epicyclic quasicircular orbits near the equatorial plane. Separating the circular orbits into four qualitatively different classes according to the sign of the canonical angular momentum of the motion and the orientation of the Lorentz force, we analyze the circular orbits using the so-called force formalism. We find the analytical solutions for the radial profiles of velocity, specific angular momentum, and specific energy of the circular orbits in dependence on the black-hole dimensionless spin and the magnetic field strength. The innermost stable circular orbits are determined for all four classes of the circular orbits. The stable circular orbits with an outward-oriented Lorentz force can extend to radii lower than the radius of the corresponding photon circular geodesic. We calculate the frequencies of the harmonic oscillatory motion of the charged particles in the radial and vertical directions related to the equatorial circular orbits and study the radial profiles of the radial, $omega_r$; vertical, $omega_theta$; and orbital, $omega_phi$, frequencies, finding significant differences in comparison to the epicyclic geodesic circular motion. The most important new phenomenon is the existence of toroidal charged particle epicyclic motion with $omega_r similar to omega_theta >> omega_phi$ that could occur around retrograde circular orbits with an outward-oriented Lorentz force. We demonstrate that for the rapidly rotating black holes the role of the "Wald induced charge" can be relevant.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review D

ISSN

2470-0010

e-ISSN

—

Volume of the periodical

93

Issue of the periodical within the volume

8

Country of publishing house

US - UNITED STATES

Number of pages

20

Pages from-to

'084012-1'-'084012-20'

UT code for WoS article

000373584100006

EID of the result in the Scopus database

2-s2.0-84963701132